Enhancement of superconductivity coexisting with charge density wave in lattice expanded \textrmNbTe₂

2024/10/02 by T. Shimokawa, Shimokawa, Takaya, Yukiko Obata +14
Chemistry · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Inorganic Chemistry and Materials #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con)

paper · pdf · doi:10.48550/arxiv.2410.01247

openalex publication_date 2024/10/02 · openalex created_date 2024/10/30 · openalex updated_date 2026/07/28

Abstract

We report a significant enhancement of superconducting transition temperature (T_\textrmc) of transition metal dichalcogenide (TMD) superconductor \textrmNbTe₂ from 0.56 K to 2.8 K. Detailed x-ray structure analysis reveals that our T_\textrmc-enhanced sample has an anisotropic lattice distortion inducing ~1% expansion of the unit cell volume and multi-domain formation in the ab planes. Despite the unit cell expansion, the distorted 1T structure, closely related to the charge density wave (CDW) order in this material, persists. Hall measurements show almost identical behaviors for both samples indicating that electronic structure does not change much due to the unit cell expansion. These results suggest that the CDW still coexists with the enhanced superconductivity unlike the other TMD superconductors.

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